自学教程：python自动计算图像数据集的RGB均值

'''qhy2018.12.3'''import osimport numpy as npimport cv2 ims_path='C:/Users/my/Desktop/JPEGImages/'# 图像数据集的路径ims_list=os.listdir(ims_path)R_means=[]G_means=[]B_means=[]for im_list in ims_list: im=cv2.imread(ims_path+im_list)#extrect value of diffient channel im_R=im[:,:,0] im_G=im[:,:,1] im_B=im[:,:,2]#count mean for every channel im_R_mean=np.mean(im_R) im_G_mean=np.mean(im_G) im_B_mean=np.mean(im_B)#save single mean value to a set of means R_means.append(im_R_mean) G_means.append(im_G_mean) B_means.append(im_B_mean) print('图片：{} 的 RGB平均值为 /n[{}，{}，{}]'.format(im_list,im_R_mean,im_G_mean,im_B_mean) )#three sets  into a large seta=[R_means,G_means,B_means]mean=[0,0,0]#count the sum of different channel meansmean[0]=np.mean(a[0])mean[1]=np.mean(a[1])mean[2]=np.mean(a[2])print('数据集的BGR平均值为/n[{}，{}，{}]'.format( mean[0],mean[1],mean[2]) )#cv.imread()读取Img时候将rgb转换为了bgr，谢谢taylover-pei的修正。